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        <ol class="chapter"><li><a href="../index.html"><strong aria-hidden="true">1.</strong> 超过 88 道练习，任点</a></li><li><a href="../low.html"><strong aria-hidden="true">2.</strong> 易</a></li><li><ol class="section"><li><a href="../hello-world/README.zh.html"><strong aria-hidden="true">2.1.</strong> hello world</a></li><li><a href="../gigasecond/README.zh.html"><strong aria-hidden="true">2.2.</strong> 千兆秒 &gt;&lt; Gigasecond)</a></li><li><a href="../leap/README.zh.html"><strong aria-hidden="true">2.3.</strong> 闰年 &gt;&lt; Leap</a></li><li><a href="../raindrops/README.zh.html"><strong aria-hidden="true">2.4.</strong> 雨滴声 &gt;&lt; Raindrops</a></li><li><a href="../reverse-string/README.zh.html"><strong aria-hidden="true">2.5.</strong> 反转字符串 &gt;&lt; Reverse String</a></li><li><a href="../nth-prime/README.zh.html"><strong aria-hidden="true">2.6.</strong> 第 n 个素数 &gt;&lt; Nth Prime</a></li><li><a href="../bob/README.zh.html"><strong aria-hidden="true">2.7.</strong> 迟钝孩子 &gt;&lt; Bob</a></li><li><a href="../beer-song/README.zh.html"><strong aria-hidden="true">2.8.</strong> 啤酒之歌 &gt;&lt; Beer Song</a></li><li><a href="../proverb/README.zh.html"><strong aria-hidden="true">2.9.</strong> 谚语串烧 &gt;&lt; Proverb</a></li><li><a href="../difference-of-squares/README.zh.html"><strong aria-hidden="true">2.10.</strong> 平方差 &gt;&lt; Difference Of Squares</a></li><li><a href="../sum-of-multiples/README.zh.html"><strong aria-hidden="true">2.11.</strong> 倍数之和 &gt;&lt; Sum Of Multiples</a></li><li><a href="../grains/README.zh.html"><strong aria-hidden="true">2.12.</strong> 谷物 &gt;&lt; Grains</a></li><li><a href="../pythagorean-triplet/README.zh.html"><strong aria-hidden="true">2.13.</strong> 勾股数 &gt;&lt; Pythagorean Triplet</a></li><li><a href="../prime-factors/README.zh.html"><strong aria-hidden="true">2.14.</strong> 素数因子 &gt;&lt; Prime Factors</a></li><li><a href="../series/README.zh.html"><strong aria-hidden="true">2.15.</strong> 子串 &gt;&lt; Series</a></li><li><a href="../armstrong-numbers/README.zh.html"><strong aria-hidden="true">2.16.</strong> 水仙花数 &gt;&lt; Armstrong Numbers</a></li><li><a href="../collatz-conjecture/README.zh.html"><strong aria-hidden="true">2.17.</strong> 3n+1 猜想 &gt;&lt; Collatz Conjecture</a></li><li><a href="../diffie-hellman/README.zh.html"><strong aria-hidden="true">2.18.</strong> 迪菲-赫尔曼密钥交换 &gt;&lt; Diffie Hellman</a></li></ol></li><li><a href="../medium.html"><strong aria-hidden="true">3.</strong> 中等</a></li><li><ol class="section"><li><a href="../saddle-points/README.zh.html"><strong aria-hidden="true">3.1.</strong> 鞍点 &gt;&lt; Saddle Points</a></li><li><a href="../isogram/README.zh.html"><strong aria-hidden="true">3.2.</strong> 等值线 &gt;&lt; Isogram</a></li><li><a href="../say/README.zh.html" class="active"><strong aria-hidden="true">3.3.</strong> 英文说数字 &gt;&lt; Say</a></li><li><a href="../run-length-encoding/README.zh.html"><strong aria-hidden="true">3.4.</strong> 游程编码 &gt;&lt; Run Length Encoding</a></li><li><a href="../isbn-verifier/README.zh.html"><strong aria-hidden="true">3.5.</strong> 图书编号 &gt;&lt; ISBN Verifier</a></li><li><a href="../perfect-numbers/README.zh.html"><strong aria-hidden="true">3.6.</strong> 数字也能分类 &gt;&lt; Perfect Numbers</a></li><li><a href="../clock/README.zh.html"><strong aria-hidden="true">3.7.</strong> 时钟 &gt;&lt; Clock</a></li><li><a href="../dot-dsl/README.zh.html"><strong aria-hidden="true">3.8.</strong> DOT DSL</a></li><li><a href="../hamming/README.zh.html"><strong aria-hidden="true">3.9.</strong> 汉明距离 &gt;&lt; Hamming</a></li><li><a href="../simple-linked-list/README.zh.html"><strong aria-hidden="true">3.10.</strong> 简单链表 &gt;&lt; Simple Linked List</a></li><li><a href="../pascals-triangle/README.zh.html"><strong aria-hidden="true">3.11.</strong> 杨辉三角形 &gt;&lt; Pascal's Triangle</a></li><li><a href="../scrabble-score/README.zh.html"><strong aria-hidden="true">3.12.</strong> 字母的分数游戏 &gt;&lt; Scrabble Score</a></li><li><a href="../pangram/README.zh.html"><strong aria-hidden="true">3.13.</strong> 全字母句 &gt;&lt; Pangram</a></li><li><a href="../paasio/README.zh.html"><strong aria-hidden="true">3.14.</strong> PaaS-IO-报告 &gt;&lt; Paasio</a></li><li><a href="../nucleotide-count/README.zh.html"><strong aria-hidden="true">3.15.</strong> 核苷酸计数 &gt;&lt; Nucleotide Count</a></li><li><a href="../luhn/README.zh.html"><strong aria-hidden="true">3.16.</strong> 模 10 算法 &gt;&lt; Luhn</a></li><li><a href="../largest-series-product/README.zh.html"><strong aria-hidden="true">3.17.</strong> 最大数字子串乘积 &gt;&lt; Largest Series Product</a></li><li><a href="../word-count/README.zh.html"><strong aria-hidden="true">3.18.</strong> 单词计数 &gt;&lt; Word Count</a></li><li><a href="../atbash-cipher/README.zh.html"><strong aria-hidden="true">3.19.</strong> Atbash 加密 &gt;&lt; Atbash Cipher</a></li><li><a href="../crypto-square/README.zh.html"><strong aria-hidden="true">3.20.</strong> 密码矩形 &gt;&lt; Crypto Square</a></li><li><a href="../rotational-cipher/README.zh.html"><strong aria-hidden="true">3.21.</strong> 旋转密码 &gt;&lt; Rotational Cipher</a></li><li><a href="../simple-cipher/README.zh.html"><strong aria-hidden="true">3.22.</strong> 简单加密 &gt;&lt; Simple Cipher</a></li><li><a href="../rail-fence-cipher/README.zh.html"><strong aria-hidden="true">3.23.</strong> 栅栏密码 &gt;&lt; Rail Fence Cipher</a></li><li><a href="../etl/README.zh.html"><strong aria-hidden="true">3.24.</strong> ETL</a></li><li><a href="../accumulate/README.zh.html"><strong aria-hidden="true">3.25.</strong> 集合操作 &gt;&lt; Accumulate</a></li><li><a href="../acronym/README.zh.html"><strong aria-hidden="true">3.26.</strong> 术语 &gt;&lt; Acronym</a></li><li><a href="../sieve/README.zh.html"><strong aria-hidden="true">3.27.</strong> 素数筛 &gt;&lt; Sieve</a></li><li><a href="../rna-transcription/README.zh.html"><strong aria-hidden="true">3.28.</strong> RNA 转录 &gt;&lt; RNA Transcription</a></li><li><a href="../triangle/README.zh.html"><strong aria-hidden="true">3.29.</strong> 三角形</a></li><li><a href="../roman-numerals/README.zh.html"><strong aria-hidden="true">3.30.</strong> 罗马数字 &gt;&lt; Roman Numerals</a></li><li><a href="../all-your-base/README.zh.html"><strong aria-hidden="true">3.31.</strong> 你所的基本</a></li><li><a href="../grade-school/README.zh.html"><strong aria-hidden="true">3.32.</strong> 学册</a></li><li><a href="../binary-search/README.zh.html"><strong aria-hidden="true">3.33.</strong> 二分查找</a></li><li><a href="../robot-simulator/README.zh.html"><strong aria-hidden="true">3.34.</strong> 机器人模拟器</a></li><li><a href="../bracket-push/README.zh.html"><strong aria-hidden="true">3.35.</strong> 括号配套</a></li><li><a href="../luhn-from/README.zh.html"><strong aria-hidden="true">3.36.</strong> Luhn From</a></li><li><a href="../queen-attack/README.zh.html"><strong aria-hidden="true">3.37.</strong> 皇后 攻击</a></li><li><a href="../bowling/README.zh.html"><strong aria-hidden="true">3.38.</strong> 保龄球</a></li><li><a href="../sublist/README.zh.html"><strong aria-hidden="true">3.39.</strong> 子列表</a></li><li><a href="../space-age/README.zh.html"><strong aria-hidden="true">3.40.</strong> 地球年</a></li><li><a href="../luhn-trait/README.zh.html"><strong aria-hidden="true">3.41.</strong> Luhn Trait</a></li><li><a href="../macros/README.zh.html"><strong aria-hidden="true">3.42.</strong> 宏</a></li><li><a href="../allergies/README.zh.html"><strong aria-hidden="true">3.43.</strong> 过敏</a></li><li><a href="../variable-length-quantity/README.zh.html"><strong aria-hidden="true">3.44.</strong> 可变长度数量</a></li><li><a href="../phone-number/README.zh.html"><strong aria-hidden="true">3.45.</strong> 电话号码</a></li><li><a href="../wordy/README.zh.html"><strong aria-hidden="true">3.46.</strong> 罗唆</a></li><li><a href="../tournament/README.zh.html"><strong aria-hidden="true">3.47.</strong> 比赛</a></li><li><a href="../custom-set/README.zh.html"><strong aria-hidden="true">3.48.</strong> 自定义 set</a></li><li><a href="../alphametics/README.zh.html"><strong aria-hidden="true">3.49.</strong> 字母谜题</a></li><li><a href="../two-bucket/README.zh.html"><strong aria-hidden="true">3.50.</strong> 两个桶</a></li><li><a href="../pig-latin/README.zh.html"><strong aria-hidden="true">3.51.</strong> 猪的拉丁文</a></li><li><a href="../diamond/README.zh.html"><strong aria-hidden="true">3.52.</strong> 钻石</a></li><li><a href="../spiral-matrix/README.zh.html"><strong aria-hidden="true">3.53.</strong> 螺旋矩阵</a></li><li><a href="../palindrome-products/README.zh.html"><strong aria-hidden="true">3.54.</strong> 回文产品</a></li><li><a href="../poker/README.zh.html"><strong aria-hidden="true">3.55.</strong> 扑克</a></li><li><a href="../grep/README.zh.html"><strong aria-hidden="true">3.56.</strong> grep</a></li><li><a href="../scale-generator/README.zh.html"><strong aria-hidden="true">3.57.</strong> 音阶生成器</a></li><li><a href="../decimal/README.zh.html"><strong aria-hidden="true">3.58.</strong> 十进制</a></li><li><a href="../anagram/README.zh.html"><strong aria-hidden="true">3.59.</strong> 字谜</a></li><li><a href="../protein-translation/README.zh.html"><strong aria-hidden="true">3.60.</strong> 蛋白质翻译</a></li><li><a href="../robot-name/README.zh.html"><strong aria-hidden="true">3.61.</strong> 机器人名称</a></li><li><a href="../book-store/README.zh.html"><strong aria-hidden="true">3.62.</strong> 书店</a></li></ol></li><li><a href="../high.html"><strong aria-hidden="true">4.</strong> 难</a></li><li><ol class="section"><li><a href="../ocr-numbers/README.zh.html"><strong aria-hidden="true">4.1.</strong> OCR 号码</a></li><li><a href="../minesweeper/README.zh.html"><strong aria-hidden="true">4.2.</strong> 扫雷</a></li><li><a href="../dominoes/README.zh.html"><strong aria-hidden="true">4.3.</strong> 骨牌</a></li><li><a href="../parallel-letter-frequency/README.zh.html"><strong aria-hidden="true">4.4.</strong> 并行字母频率</a></li><li><a href="../rectangles/README.zh.html"><strong aria-hidden="true">4.5.</strong> 矩形</a></li><li><a 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                    <a class="header" href="#say" id="say"><h1>Say</h1></a>
<a class="header" href="#1-readme" id="1-readme"><h2>1. Readme</h2></a>
<a class="header" href="#说" id="说"><h1>说</h1></a>
<p>提供一个 0 到 999,999,999,999 之间的数字,用英语拼出这个数字.</p>
<a class="header" href="#步骤-1" id="步骤-1"><h2>步骤 1</h2></a>
<p>处理 0 到 99 的基本情况.</p>
<p>如果程序的输入是<code>22</code>,那么输出应该是<code>'twenty-two'</code>.</p>
<p>如果给出超出规定范围的数字,您的程序应该大声抱怨。</p>
<p>这个程序的一些好的测试用例是:</p>
<ul>
<li><code>0</code></li>
<li><code>14</code></li>
<li><code>50</code></li>
<li><code>98</code></li>
<li><code>-1</code></li>
<li><code>100</code></li>
</ul>
<a class="header" href="#扩展" id="扩展"><h3>扩展</h3></a>
<p>如果您使用的是 Mac,那就是 Mac OS X 的 shell 可以用<code>say</code>程序大声说出来。如果您使用的是 Linux 或 Windows,则可以使用<code>espeak</code>命令使用 eSpeakNG.</p>
<a class="header" href="#第-2-步" id="第-2-步"><h2>第 2 步</h2></a>
<p>实现将数子分成块.</p>
<p>像<code>1234567890</code>，应该产生如 1,234,567 和 890 的列表,而更简单<code>1000</code>应该只产生 1 和 0.</p>
<p>该程序还必须报告超出范围的值。</p>
<a class="header" href="#第-3-步" id="第-3-步"><h2>第 3 步</h2></a>
<p>现在处理在这些块之间，插入适当的缩放词.</p>
<p>所以<code>1234567890</code>应该输出<code>'1 billion 234 million 567 thousand 890'</code></p>
<p>该程序还必须报告超出范围的值。上限为”兆（trillion）”处就可以.</p>
<a class="header" href="#第-4-步" id="第-4-步"><h2>第 4 步</h2></a>
<p>把它们放在一起，除了简单的英语之外什么都没有.</p>
<p><code>12345</code>应该给出<code>twelve thousand three hundred forty-five</code>.</p>
<p>该程序还必须报告超出范围的值.</p>
<a class="header" href="#扩展-1" id="扩展-1"><h3>扩展</h3></a>
<p>(正确地)使用英语<em>and</em>合并数字:</p>
<ul>
<li><code>14</code> =&gt; “fourteen”.</li>
<li><code>100</code> =&gt; “one hundred”.</li>
<li><code>120</code> =&gt; “one hundred and twenty”.</li>
<li><code>1002</code> =&gt; “one thousand and two”.</li>
<li><code>1323</code> =&gt; “one thousand three hundred and twenty-three”.</li>
</ul>
<a class="header" href="#特定的-rust-练习笔记" id="特定的-rust-练习笔记"><h2>特定的 Rust 练习笔记</h2></a>
<p>与本练习的其他语言版本相比,Rust 版本略有改变。我们使用 Rust 的强类型系统来限制输入,而不是要求您返回超出范围的错误。让函数处理所有有效输入要容易得多,而不是要求，使用模块的用户处理错误。</p>
<p>有一个 -1 版本的测试用例,但它被注释掉了。如果您的函数正确实现,则不应编译 -1 测试用例.</p>
<p>在测试用例中尚未实现，将”and”添加到数字文本中.</p>
<a class="header" href="#扩展-2" id="扩展-2"><h3>扩展</h3></a>
<p>添加转换为 u64 的最大值的功能:9,223,372,036,854,775,807.</p>
<p>有关输出的提示,请查看最后一个测试用例.</p>
<a class="header" href="#资源" id="资源"><h2>资源</h2></a>
<p>JavaRanch CattleDrive 的变体,练习 4a<a href="http://www.javaranch.com/say.jsp">http://www.javaranch.com/say.jsp</a></p>
<a class="header" href="#2-开始你的表演" id="2-开始你的表演"><h2>2. 开始你的表演</h2></a>
<pre><pre class="playpen"><code class="language-rust editable">pub fn encode(n: u64) -&gt; String {
   unimplemented!(&quot;Say {} in English.&quot;, n);
}

</code></pre></pre>
<a class="header" href="#3-测试代码查看" id="3-测试代码查看"><h2>3. 测试代码查看</h2></a>
<pre><pre class="playpen"><code class="language-rust">
# #![allow(unused_variables)]
#fn main() {
// Note: No tests created using 'and' with numbers.
// Apparently Most American English does not use the 'and' with numbers,
// where it is common in British English to use the 'and'.

#[test]
fn test_zero() {
   assert_eq!(encode(0), String::from(&quot;zero&quot;));
}

//
// If the below test is uncommented, it should not compile.
//
/*
#[test]
//#[ignore]
fn test_negative() {
   assert_eq!(encode(-1), String::from(&quot;won't compile&quot;));
}
*/

#[test]
//#[ignore]
fn test_one() {
   assert_eq!(encode(1), String::from(&quot;one&quot;));
}

#[test]
//#[ignore]
fn test_fourteen() {
   assert_eq!(encode(14), String::from(&quot;fourteen&quot;));
}

#[test]
//#[ignore]
fn test_twenty() {
   assert_eq!(encode(20), String::from(&quot;twenty&quot;));
}

#[test]
//#[ignore]
fn test_twenty_two() {
   assert_eq!(encode(22), String::from(&quot;twenty-two&quot;));
}

#[test]
//#[ignore]
fn test_one_hundred() {
   assert_eq!(encode(100), String::from(&quot;one hundred&quot;));
}

// note, using American style with no and
#[test]
//#[ignore]
fn test_one_hundred_twenty() {
   assert_eq!(encode(120), String::from(&quot;one hundred twenty&quot;));
}

#[test]
//#[ignore]
fn test_one_hundred_twenty_three() {
   assert_eq!(encode(123), String::from(&quot;one hundred twenty-three&quot;));
}

#[test]
//#[ignore]
fn test_one_thousand() {
   assert_eq!(encode(1000), String::from(&quot;one thousand&quot;));
}

#[test]
//#[ignore]
fn test_one_thousand_two_hundred_thirty_four() {
   assert_eq!(
       encode(1234),
       String::from(&quot;one thousand two hundred thirty-four&quot;)
   );
}

// note, using American style with no and
#[test]
//#[ignore]
fn test_eight_hundred_and_ten_thousand() {
   assert_eq!(encode(810_000), String::from(&quot;eight hundred ten thousand&quot;));
}

#[test]
//#[ignore]
fn test_one_million() {
   assert_eq!(encode(1_000_000), String::from(&quot;one million&quot;));
}

// note, using American style with no and
#[test]
//#[ignore]
fn test_one_million_two() {
   assert_eq!(encode(1_000_002), String::from(&quot;one million two&quot;));
}

#[test]
//#[ignore]
fn test_1002345() {
   assert_eq!(
       encode(1_002_345),
       String::from(&quot;one million two thousand three hundred forty-five&quot;)
   );
}

#[test]
//#[ignore]
fn test_one_billion() {
   assert_eq!(encode(1_000_000_000), String::from(&quot;one billion&quot;));
}

#[test]
//#[ignore]
fn test_987654321123() {
   assert_eq!(
       encode(987_654_321_123),
       String::from(
           &quot;nine hundred eighty-seven billion \
            six hundred fifty-four million \
            three hundred twenty-one thousand \
            one hundred twenty-three&quot;
       )
   );
}

/*
 These tests are only if you implemented full parsing for u64 type.
*/
#[test]
//#[ignore]
fn test_max_i64() {
   assert_eq!(
       encode(9_223_372_036_854_775_807),
       String::from(
           &quot;nine quintillion two hundred twenty-three \
            quadrillion three hundred seventy-two trillion \
            thirty-six billion eight hundred fifty-four million \
            seven hundred seventy-five thousand eight hundred seven&quot;
       )
   );
}

#[test]
//#[ignore]
fn test_max_u64() {
   assert_eq!(
       encode(18_446_744_073_709_551_615),
       String::from(
           &quot;eighteen quintillion four hundred forty-six \
            quadrillion seven hundred forty-four trillion \
            seventy-three billion seven hundred nine million \
            five hundred fifty-one thousand six hundred fifteen&quot;
       )
   );
}

#}</code></pre></pre>
<a class="header" href="#4-答案" id="4-答案"><h2>4. 答案</h2></a>
<p><details></p>
<pre><pre class="playpen"><code class="language-rust">
# #![allow(unused_variables)]
#fn main() {
const SMALL: &amp;'static [&amp;'static str] = &amp;[
   &quot;zero&quot;,
   &quot;one&quot;,
   &quot;two&quot;,
   &quot;three&quot;,
   &quot;four&quot;,
   &quot;five&quot;,
   &quot;six&quot;,
   &quot;seven&quot;,
   &quot;eight&quot;,
   &quot;nine&quot;,
   &quot;ten&quot;,
   &quot;eleven&quot;,
   &quot;twelve&quot;,
   &quot;thirteen&quot;,
   &quot;fourteen&quot;,
   &quot;fifteen&quot;,
   &quot;sixteen&quot;,
   &quot;seventeen&quot;,
   &quot;eighteen&quot;,
   &quot;nineteen&quot;,
];

const TENS: &amp;'static [&amp;'static str] = &amp;[
   &quot;ones&quot;, &quot;ten&quot;, &quot;twenty&quot;, &quot;thirty&quot;, &quot;forty&quot;, &quot;fifty&quot;, &quot;sixty&quot;, &quot;seventy&quot;, &quot;eighty&quot;, &quot;ninety&quot;,
];

const SCALE: &amp;'static [&amp;'static str] = &amp;[
   &quot;&quot;,
   &quot;thousand&quot;,
   &quot;million&quot;,
   &quot;billion&quot;,
   &quot;trillion&quot;,
   &quot;quadrillion&quot;,
   &quot;quintillion&quot;,
];

pub fn encode(n: u64) -&gt; String {
   if n &lt; 20 {
       SMALL[n as usize].to_string()
   } else if n &lt; 100 {
       let small = n % 10;
       let mut out = String::from(TENS[n as usize / 10]);
       if small &gt; 0 {
           out.push('-');
           out.push_str(SMALL[small as usize]);
       }
       out
   } else if n &lt; 1000 {
       let mut out = String::from(SMALL[n as usize / 100]);
       out.push_str(&quot; hundred&quot;);
       let ones = n % 100;
       if ones &gt; 0 {
           out.push(' ');
           out.push_str(&amp;encode(ones));
       }
       out
   } else {
       let mut sets: Vec&lt;u64&gt; = Vec::new();
       let mut val = n;
       while val &gt;= 1 {
           sets.push(val % 1000);
           val /= 1000;
       }
       let mut out = String::new();
       while let Some(modu) = sets.pop() {
           let len = sets.len();
           if modu == 0 {
               continue;
           }
           if out.len() &gt; 0 {
               out.push(' ');
           }
           out.push_str(&amp;encode(modu));
           if len &gt; 0 {
               out.push(' ');
               out.push_str(SCALE[len]);
           }
       }
       out
   }
}

#}</code></pre></pre>
<p></details></p>
<hr />
<hr />
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